Turntable for sound picture apparatus



April 19, 1932. J R MEL 1,854,941

TURNTABLE FOR SOUND PICTURE APPARATUS Filed May 8, 1930 Patented Apr. 19. 1932 UNITED STATES PATENT 'oFrlcE JOHN OF CHICAGO, ILLINOIS, ASSIGNOR TOAUDI'IONE COMPANY, 01 CHICAGO, ILLINOIS, ACOBPORATION OF ILLINOIS momenta ron SOUND-PICTURE APPARATUS Application filed May 8,

In sound motion picture apparatus it has been common in certain types to record the sound on disks, which are then driven in synchronism with the motion picture machine g with a suitable pick-up for the record from its sound groove. When this is done, however, it is necessary toprovide a drive between the turntable on which the .disk is driven, and the motion picture machine. This drive is usually quite complicated, and is made up of a multiplicity of parts more or less loosely fastened together, and all of the accumulated errors and irregularities and loosenesses of all of these parts are trans- 16 mitted to the turntable, with the result that the turntable is often driven in a very irregular and jerky manner, with the result that the sound produced by the pick-up is also rough and irregular.

l0 An object of this invention is to provide a means for smoothing out the drive of the turntable so that the sound produced by the pick-up and its amplifier will likewise be smooth and natural.

This an other objects, as will later appear, are accomplished by this invention which is fully described in the following specification, and shown in the accompanying drawings, in which- Figure 1 is a vertical section on the line 1-1 of Fig. 2; and i Fig. 2 is a horizontal section on the line 22 of Fi 1. The embodiment illustrated comprises a.

.phonographic turntable 10 which is carried upon a vertical shaft 11, the shaft carrying a pin 12, the ends of which are surrounded by rubber washers 13 which insulate the pin 12 from the hub of the turntable so as to minimize the transmission of vibrations of all kinds from the shaft 11 to the turntable 10.

The shaft 11 is mounted in bearings 14 and 15, preferably ball bearings, which are carried by a gear housing 16 and by its cover as a thrust bearing to take the weight of the turntable 10. The shaft 11 has a collar 18 secured thereto by means of a pin 19. Leaf springs 20 are secured to the collar 18 by 17, respectively, the bearing 15 serving also means of screws 21. These springs are sepa- 1930. Serial m). 450,633.

rated some distance at their outer ends, when released, as shown in dotted lines on the right-hand side of Fig. 2, but these ends are normally held deflected in operative position between pins 22, which are spaced apart and carried by a worm wheel 23, which carries a bushing 24 by means of which it is journaled upon the shaft 11, and rests upon a thrust bearing 25 which is carried upon a suitable ledge 1n the gear housing 16. The worm wheel 23 is driven by means of a worm 26, which is carried upon a shaft 27 mounted in suitable bearings 28, 29 in the extension 16 of the gear housing 16.

Thus it will be seen that when the shaft 27 is connected through any suitable drive mechanism with a motion picture projector (not shown), all irregularitiesof the drive previously mentioned will be transmitted to the worm wheel 23. It is necessary, however, that these irregularities of motion shall not be transmitted to the turntable 10, but that the latter shall have substantially a uniform motion.

This is accomplished by the mechanism shown, which acts as follows: The worm Wheel 23 driven by the shaft 27 acts through the pins 22 to drive the shaft 11 through the leaf springs 20. The latter are set so as to oppose each other thereby taking care of any back-lash which might occur due to a tendency of the Worm wheel 23 to run either ahead of or behind the speed of theturntable 10 at any given instant. The result is that any sudden jerk occurring in the shaft 27 in either direction is taken up by the springs 20, and is not passed on to the turntable 10. p

Thus it will be seen that the turntable 10 carrying a disk A on which operates any suitable form of sound pick-up B is rendered quite smooth and uniform in its action irrespective of any slight jerks which might occur in the shaft 27. Consequently, the tone which isthus obtained from the disk A will be much truer in character, and will be free from those irregularities which are due to the drive which couples the reproducer with the motion picture projector.

While I have shown and described'but a single embodiment of my invention, it is to be understood that it is capable of many modifications. Changes, therefore in the construction and arrangement may be made which do not depart from the spirit and scope of the invention as covered by the appended claims.

I claim:

1. A yieldable drive for phonogra h turntables .and the like comprising a e, a floating member comprising a turntable having a shaft, said shaft being journaled in said frame, a driving member rotatably carried by said shaft, a plurality of pins in one member, and a plurality of springs secured to the other member, said springs being initially deformed so as to oppose each other and engaging said pins for yieldably driving said floating member, said pins being arranged in spaced pairs on opposite sides of the axis.

2. A yieldable drive for phonogra h turntables and the like comprising a ame, a floating member comprising a turntable having a shaft, said shaft being journaled in said frame, a driving member rotatabl carried by said shaft, means'on said floating member for yieldably engaging said driving member to yieldably drive the floating member, and a cover on the frame enclosing said yieldable driving means.

- 3. A yieldable drive for phonograph turntables and the like comprising a frame, a floating member comprising a turntable having a shaft, said shaft being journaled in said frame, a driving member rotatably carried by said shaft, a plurality'of pins in one member, and a plurality of springs secured to the other member, said pins being arranged in spaced pairs, and said springs being initially deformed so as to lay between said pins for yieldably driving said floating f' 1a b1 a f h h turn 4. yie a e rive orp onogra tables and the like comprising a fiame, a floating member comprising a turntable having a shaft, said shaft being journaled in said frame, a driving member rotatably carried by said shaft, a plurality of pins in one member, and a plurality of springs secured to the other member, said pins being arranged in spaced pairs, and said springs extending outwardly and being initially deformed so as to lay between said ins for yieldably driving said floating member.

In testimony whereof, I have hereunto set my hand this30th day of April, 1930.

\ JOHN BIPLEY KIEL. 

